Improvement in hinges for sewing-machines



vROSWELL H. St; JOHN. Improvement in Hinges for Sewing Machines.

No. 119,665. Patenfed oct. 3,1871.

UNITED STATES PATENT QFFICE.

ROSWELL H. ST. JOHN, OF BELLEFONTAINE, OHIO.

IMPROVEMENT IN HINGES FOR SEWING-MACHINES.

Specification forming part of Letters Patent No. 119,665, dated October3, 1871.

To all whom t may concern:

Be it known that I, RoswnLL H. ST. J oHN, of Bellefontaine, Logancounty, State of Ohio, have invented a new and Improved Hinge forSewing- Machines, of which the following is a specification.

This hinge, for connecting the bed-plate of the works to the table, isso constructed as to prevent the vibration of the works beingcommunicated to the table, and thereby avoid or lessen the jar and noiseincident to the reciprocation of the moving parts. It is designed forthose machines which are turned back to enable the parts beneath thebed-plate to be examined or adjusted.

In the accompanying drawing, Figure l is a vertical section. Fig. 2 is aperspective view of the hinge in detached parts.

The same letters refer to corresponding parts in the several figures.

rIhe hinge consists of a leaf, A, and a stem, B, the latter having' aresilient sleeve which intervenes between the stem and the table. Theleaf A is of such form as may be required, according to the character ofthe bed-plate, a portion of which is represented at D. E is a portion ofthe table on which the working' portion of the machine is imposed. F isthe pintle of the hinge; B, the stem. C C` O are rings of India rubber,which isolate the metal of the stem from the table. b is a shoulder onthe stem, resting on the upper ring of rubber. b is a washer, and b apin to keep the latter against the lower ring G. The three rings combineto form a sleeve. I have shown this as one form of my invention, but Ido not comine myself to the shape. Asingle sleeve or wrapper may be madeto answer the purpose.

In my former patent, dated March 21, 1871, I separated the two leaves ofa sewing-machine hinge by intervening India rubber, so that tremorimparted to one leaf by the works is absorbed to a considerable extentand not imparted to the lower leaf, which is attached to the table. Therubber isolates metal from metal, and decreases the jar and noise byarresting it at this point, thus preventing the communication of thetremor to the table and floor of the apartment. In the present inventionthelower portion is isolated from the table and stand, arresting thetremor at that point.

I am aware that hinges have been screwed onto a pad of cloth or rubberwhich intervenes between one leaf of the hinge and the object to whichit is screwed; but in this case the heads of the screws rest on themetal of the hinge, and the worm of the screw is in such intimatecontact with said object that the tremor is communicated from they hingethereto.

I do not coniine myself to the exact form of the parts; but

What I do claim is- A hinge, one or both of whose members is clothedwith resilient material on those portions which come in contact with theobject to which it is attached to perfectly isolate it therefrom, forthe purpose described.

ROSWELL H. ST. JOHN.

Witnesses PHILANDER J oNEs,

C. R. ST. JOHN. (45)

